Add configurable concurrent reconciliation to controllers

[rahulbabu95]

Description

The controller-runtime defaults MaxConcurrentReconciles to 1, which creates a bottleneck when multiple BMC operations need to be processed simultaneously. This is particularly noticeable during cluster provisioning when many nodes are being set up in parallel.

This change adds a CLI flag (--max-concurrent-reconciles) and corresponding environment variable (RUFIO_MAX_CONCURRENT_RECONCILES) to configure the number of concurrent reconciliations across all controllers.

Why is this needed

Performance testing with 30 nodes showed:

• Default (1): 647 seconds total execution time
• Setting to 5: 181 seconds (72% faster)
• Setting to 10: 124 seconds (80% faster)

Fixes: #
#311

How Has This Been Tested?

How are existing users impacted? What migration steps/scripts do we need?

Checklist:

I have:

• updated the documentation and/or roadmap (if required)
• added unit or e2e tests
• provided instructions on how to upgrade

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 13 lines in your changes missing coverage. Please review.

Project coverage is 46.85%. Comparing base (61d8853) to head (429bbe8).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
main.go	0.00%	7 Missing ⚠️
controller/job.go	0.00%	2 Missing ⚠️
controller/machine.go	0.00%	2 Missing ⚠️
controller/task.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #312      +/-   ##
==========================================
- Coverage   47.02%   46.85%   -0.18%     
==========================================
  Files          11       11              
  Lines        1361     1366       +5     
==========================================
  Hits          640      640              
- Misses        664      669       +5     
  Partials       57       57              

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